Are you willing to drain and refill the pool? It may be cheaper and certainly quicker than trying to clear the pool of this unknown "hobo-soup" of pool store chemicals. Was the pool clear when first filled?

If you're going to refill, what does the inside of the toilet tanks look like?(presuming it's the same city water source)

@Watermom: Sorry for the simul-post, glad we're pretty much on the same page.